Key Seat Sticking – This occurs in an open hole when drilling either a directional well, or a well that deviates from true vertical.

Sloughing Hole Sticking – Here’s a problem encountered in drilling through heaving shale or other formations that have a tendency to break off and fall in the bore hole. The formation lodges around tool joints, stabilizers or drill collars.

Under-gauge Hole Sticking – This type of sticking occurs when a shale formation deforms, a salt that has tendency to flow, or a bit that is worn on the O.D. by abrasive sand.

Differential Sticking – Pipe can get stuck in an open hole when the pipe string comes in contact with a permeable formation of lesser pressure than the hydrostatic pressure of the drilling fluid.

Blow-out Sticking – When underground pressure exceeds the existing hydrostatic pressure of the well fluid, it can cause sand, shale, other formations and even pipe protector rubbers to be blown up the hole, bridge over and string of pipe.

Cemented Sticking – Cementing may cause stuck pipe when there is a mechanical malfunction, human error, a lost circulation problem or during cementing to contain a blowout.

Lost Circulation Sticking – This is an occurrence that normally react to hole sloughing or well blowouts.